A detachable vehicle-mounted storage box for electric power security tools is of a rectangular box body structure which is defined by a front side wall, a rear side wall, a left side wall, a right side wall and a bottom plate. The detachable vehicle-mounted storage box is placed on the front side of an engineering van carriage, and the rear side wall of the box body is fixed on a transverse side wall at the front end of the engineering van carriage through bolts. The detachable vehicle-mounted storage box for the electric power security tools has the advantages of being simple in structure and convenient to mount. The electric power security tools can be stored in a classified mode during vehicle-mounted transportation, so that standardized management is achieved, the convenience for storing and taking the security tools is improved in the site construction process, the ready time of construction is shortened, and the working efficiency is improved. Collision is further avoided between the tools or between the tools and the carriage in the transportation process, and therefore the protective property is improved.